Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
van cham » van chat, van tham, va cham
thu sach » thuat sach, thuoc sach, thu hoach
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
doi cua » dai cua, hoi cua
truc va » thuc va, thuc vat, trung va
tu sach » su sach, te sach, tu cach
ly nang » ky nang, ly hang, ly vang
do cua » co cua, de cua, dong cua
x hoi » xa hoi, o hoi, x ho

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)) ly nang x hoi. hieu van cham truc va thanh ((do cua) OR (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ly nang x hoi. hieu van cham truc va thanh ((do cua) OR (doi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ly nang x hoi. hieu van cham truc va thanh ((do cua) OR (doi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ly nang x hoi. hieu van cham truc va thanh ((do cua) OR (doi cua)) tre*.