Perhaps you should try some spelling variations:
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
cau tren » cu tren, dau tren, ca tren
tinh cau » trinh cau, tinh cao, sinh cau
sach ty » sach y, sach tu, sach thu
hoc ban » hoc bang, hoc dan, hoc bai
soc ban » coc ban, so ban, soc ba
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va cham » va chat, va tham

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty ((nang ma) or (nang x)) hoi. hieu va cham ((soc ban) OR (hoc ban)) nhanh tinh cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((nang ma) OR (nang x)) hoi. hieu va cham ((soc ban) OR (hoc ban)) nhanh tinh cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((nang ma) or (nang x)) hoi. hieu va cham ((soc ban) OR (hoc ban)) nhanh tinh cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang ma) or (nang x)) hoi. hieu va cham ((soc ban) OR (hoc ban)) nhanh tinh cau tren*.