Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh tai » thanh tai, hang tai, han tai
tai cua » thai cua, tai cuc, tri cua
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ty ((nang xa) OR (nang ma)) hoi. hieu va cam ((luc va) or (tuc xa)) hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty ((nang xa) OR (nang ma)) hoi. hieu va cam ((luc va) OR (tuc xa)) hanh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ty ((nang xa) OR (nang ma)) hoi. hieu va cam ((luc va) or (tuc xa)) hanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ty ((nang xa) OR (nang ma)) hoi. hieu va cam ((luc va) or (tuc xa)) hanh tai cua te*.