Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dan trinh » dan tinh, van trinh, hanh trinh
giau cua » gian cua, gia cua, dieu cua
tu sach » thu sach, su sach, te sach
cac xuc » cam xuc, cac nuoc, chat xuc
via cua » gia cua, gian cua, rija cua
xuc dan » tuc dan, duc dan, xuc ban
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa

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 (thuoc sach)) ky tang ma hoi. hieu ve cac xuc dan trinh ((via cua) OR (giau cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky tang ma hoi. hieu ve cac xuc dan trinh ((via cua) OR (giau cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) ky tang ma hoi. hieu ve cac xuc dan trinh ((via cua) OR (giau cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky tang ma hoi. hieu ve cac xuc dan trinh ((via cua) OR (giau cua)) tre*.