Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
cham xuc » cam xuc, chat xuc, cham soc
tu sach » su sach, te sach, tu cach
vu cham » va cham, vu kham, tu cham
doi cua » dai cua, hoi cua, dong cua
xuc van » duc van, luc van, xuc ban
hieu vu » hieu va, hieu ve, hieu su
tang ho » tang cho, tung ho, tang ha
ky tang » ky nang, ky dang, kho tang
ho hoi » hoc hoi, hoa hoi, hoi hoi
di cua » dai cua, de cua, do cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ky tang ho hoi. hieu vu cham xuc van hanh ((di cua) OR (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky tang ho hoi. hieu vu cham xuc van hanh ((di cua) OR (doi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky tang ho hoi. hieu vu cham xuc van hanh ((di cua) OR (doi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky tang ho hoi. hieu vu cham xuc van hanh ((di cua) OR (doi cua)) tre*.