Perhaps you should try some spelling variations:
lanh hai » manh hai, thanh hai, lang chai
hieu van » hieu va, thien van, lieu va
va lanh » va lang, va danh, va hanh
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
la tren » loai tren, dua tren, dat tren
sach ly » sach y, sach lo, sach hay
mai hoi » mai khoi, dai hoi, lai hoi
sach ty » sach y, sach tu, sach thu
tuc va » thuc va, truc va, tuc xa
hai la » hai lan, phai la, hai ba

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ly) or (sach ty)) nang ((mai hoi) or (xa hoi)). hieu van cam tuc va lanh hai la tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ly) OR (sach ty)) nang ((mai hoi) OR (xa hoi)). hieu van cam tuc va lanh hai la tren.
• Adding a wildcard symbol may retrieve word variants: su ((sach ly) or (sach ty)) nang ((mai hoi) or (xa hoi)). hieu van cam tuc va lanh hai la tren*.