Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh van » thanh van, khanh van, hanh va
thu sach » tu sach, thuoc sach, thu hoach
hau tren » dau tren, cau tren, thai tren
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
truc va » thuc va, thuc vat, trung va
van hau » van ha, van hai, van dau
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (thuat sach)) ky nang co hoc. hieu ve cham ((truc va) or (luc va)) hanh van hau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ky nang co hoc. hieu ve cham ((truc va) OR (luc va)) hanh van hau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuat sach)) ky nang co hoc. hieu ve cham ((truc va) or (luc va)) hanh van hau tren".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuat sach)) ky nang co hoc. hieu ve cham ((truc va) or (luc va)) hanh van hau tren*.