Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cham truc » cau truc, nham thuc, pham thuc
thu sach » tu sach, thuoc sach, thu hoach
dau tren » dau tien, dat tren, dau tieng
va cham » va chat, va tham
nang xa » nang x, lang xa, mang xa
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
nang ma » tang ma, sang ma, nang cao
vi dau » vi dai, va dau, bi dau

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)) y ((nang xa) or (nang ma)) hoi. lieu va cham truc va hanh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) y ((nang xa) OR (nang ma)) hoi. lieu va cham truc va hanh vi dau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuat sach)) y ((nang xa) or (nang ma)) hoi. lieu va cham truc va hanh vi dau tren*".