Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
hieu van » hieu va, thien van, lieu va
hanh dao » lanh dao, thanh dat, thanh dam
cau tren » cu tren, dau tren, ca tren
ky lang » ky dang, ky tang, tay lang
van hoc » van hoa
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau treo
nuoc » quoc, duoc, ngoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu khach ((ky lang) or (ky nang)) xa hoi. hieu van hoc nuoc va hanh dao ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ((ky lang) OR (ky nang)) xa hoi. hieu van hoc nuoc va hanh dao ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: vu khach ((ky lang) or (ky nang)) xa hoi. hieu van hoc nuoc va hanh dao ((cuu tre) or (cau tren))*.