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

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